Abstract
Three-dimensional laminar fluid flow and heat transfer in a micro heat sink with cavities and internal ribs are investigated using numerical methods. Moreover, according to the second law of thermodynamics, the model of entropy generation is also established for variable cross section of the microchannel. The simulation encompasses Reynolds number of 198–600, relative cavity height e 1/D h values of 0–0.65, relative rib height e 2/D h range of 0–0.2167. The results show that the effect of relative rib height on entropy generation is significant, while the relative cavity height has little effect on it. The combined effect of cavities and ribs in the microchannel has better performance of heat transfer than the smooth microchannel under similar conditions. Extensive simulations are conducted to collect data on the characteristics of heat transfer and fluid flow in a micro heat sink with cavities and internal ribs. Using these data, correlations for Nusselt number and friction factor in terms of Reynolds number and the geometry of cavity and rib have been developed.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Feng H J, Chen L G, Xie Z H, et al. Thermal insulation constructal optimization for steel rolling reheating furnace wall based on entransy dissipation extremum principle. Sci China Tech Sci, 2012, 55: 3322–3333
Tuckerman D B, Pease R F W. High-performance heat sinking for VLSI. IEEE Electron Device Lett, 1981, 2(5): 126–129
Bilen K, Cetin M, Gul H, et al. The investigation of groove geometry effect on heat transfer for internally grooved tubes. Appl Therm Eng, 2009, 29(4): 753–761
Mesalhy O M, Abdel Aziz S S, El-Sayed M M. Flow and heat transfer over shallow cavities. Int J Thermal Sci, 2010, 49(3): 514–521
Chai L, Xia G D, Zhou M Z, et al. Numerical simulation of fluid flow and heat transfer in a microchannel heat sink with offset fan-shaped reentrant cavities in sidewall. Int Commun Heat Mass Transfer, 2011, 38(5): 577–584
Bejan A, Tsatsaronis M, Moran M. Thermal Design and Optimization. New York: Wiley-Interscience Publication, 1996. 463–506
Haddad O, Abuzaid M, Al-Nimr M. Entropy generation due to laminar incompressible forced convection flow through parallel-plates microchannel. Entropy, 2004, 6(5): 413–426
Ko T H. Numerical investigation on laminar forced convection and entropy generation in a curved rectangular duct with longitudinal ribs mounted on heated wall. Int J Thermal Sci, 2006, 45(4): 390–404
Xia G D, Chai L, Yang R B, et al. Influence of structural parameters on fluid flow and heat transfer in microchannel with periodically changeable cross-sections (in Chinese). J Chem Indus Eng, 2009, 60(11): 2705–2711
Wang F, Wang G. Heat transfer augmentation and entropy generation analysis of a helically coiled tube with internal longitudinal fins. Chem Eng Technol, 2011, 34(11): 1876–1882
Eiamsa-ard S, Promvonge P. Thermal characteristics of turbulent rib-grooved channel flows. Int Commun Heat Mass Transfer, 2009, 36(7): 705–711
Hans V S, Saini R P, Saini J S. Heat transfer and friction factor correlations for a solar air heater duct roughened artificially with multiple V-ribs. Sol Energy, 2010, 84(6): 898–911
Jaurker A R, Saini J S, Gandhi B K. Heat transfer and friction characteristics of rectangular solar air heater duct using rib-grooved artificial roughness. Sol Energy, 2006, 80(8): 895–907
Bejan A. Entropy Generation Through Heat and Fluid Flow. New York: Wiley-Interscience Publication, 1982. 89–190
Qu W, Mudawar I. Experimental and numerical study of pressure drop and heat transfer in a single-phase micro-channel heat sink. Int J Heat Mass Transfer, 2002, 45(12): 2549–2565
Shah R K, London A L. Laminar Flow Forced Convection in Ducts, Supplement 1. New York: Academic Press, 1978. 17–36
Steinke M E, Kandlikar S G. Single-phase liquid friction factors in microchannels. Int J Thermal Sci, 2006, 45(11): 1073–1083
Chai L, Xia G D, Zhou M Z. Effects of structural parameters on fluid flow and heat transfer in a microchannel with aligned fan-shaped reentrant cavities. Int J Thermal Sci, 2011, 50(3): 411–419
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Xia, G., Zhai, Y. & Cui, Z. Characteristics of entropy generation and heat transfer in a microchannel with fan-shaped reentrant cavities and internal ribs. Sci. China Technol. Sci. 56, 1629–1635 (2013). https://doi.org/10.1007/s11431-013-5244-z
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11431-013-5244-z